# Center for AI Safety releases HLE-Diamond, a refined subset of Humanity's Last Exam

HLE-Diamond follows a year-long cleaning and refinement process that included input from research communities, and the release is with ScaleAILabs.

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Source: Center for AI Safety · Published 9/23/2026, 10:49:56

Center for AI Safety is releasing [HLE-Diamond](https://lastexam.ai/blog/hle-diamond), a refined subset of Humanity's Last Exam (HLE), with ScaleAILabs. The subset follows a year-long process of cleaning and refinement, with input from various research communities.

Tags: HLE-Diamond, Humanity's Last Exam, Center for AI Safety, AI benchmark, ScaleAILabs

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